voidpkgs/mod_packages/polkit/files/10-udisks2.rules

// Allow udisks2 to mount devices without authentication
// for users in the "storage" group.
polkit.addRule(function(action, subject) {
    if ((action.id == "org.freedesktop.udisks2.filesystem-mount-system" ||
         action.id == "org.freedesktop.udisks2.filesystem-mount") &&
	subject.isInGroup("storage")) {
        return polkit.Result.YES;
    }
});